【摘要】：隨著我國自主研制的“北斗二代”衛(wèi)星導(dǎo)航系統(tǒng)成功投入運營,用戶設(shè)備部分即北斗衛(wèi)星導(dǎo)航接收機(jī)的研制也蓬勃發(fā)展,其中信號捕獲是接收機(jī)研制過程中至關(guān)重要的第一步。目前信號捕獲技術(shù)的研究主要集中于提高對GPS衛(wèi)星信號捕獲的精度和靈敏度等性能,然而“北斗二代”B1I信號比特極性翻轉(zhuǎn)頻繁的特性,導(dǎo)致針對GPS衛(wèi)星信號的捕獲算法無法直接應(yīng)用于北斗導(dǎo)航接收機(jī)中,因此研究適用于“北斗二代”B1I信號的捕獲技術(shù)對于北斗導(dǎo)航接收機(jī)的發(fā)展具有重要意義。論文首先對“北斗二代”衛(wèi)星信號的結(jié)構(gòu)和傳統(tǒng)捕獲算法進(jìn)行了分析和研究,針對“北斗二代”B1I信號比特極性翻轉(zhuǎn)頻繁的問題,設(shè)計了時域并行的粗捕獲算法,并對該算法進(jìn)行了性能分析和實驗驗證。針對粗捕獲得到的載波多普勒頻移精度較低的問題,論文設(shè)計了利用切比雪夫線性最小二乘曲線擬合法改進(jìn)數(shù)值逼近算法的載波頻率精細(xì)捕獲算法,并對該算法進(jìn)行性能分析和實驗驗證,實驗結(jié)果顯示該算法對載波頻率的估計精度達(dá)到20Hz,有效地提高了載波頻率的估計精度。針對城市、室內(nèi)等弱信號環(huán)境下的信號捕獲,論文為GEO衛(wèi)星和IGSO/MEO衛(wèi)星分別設(shè)計了差分非相干積分算法和本地調(diào)制NH碼的相干積分算法,通過弱信號實驗測試,驗證了算法可以提高7dB的弱信號捕獲能力。最后論文將粗捕獲算法、精捕獲算法和弱信號捕獲算法組成信號捕獲系統(tǒng),在FPGA+DSP的導(dǎo)航接收機(jī)開發(fā)平臺上進(jìn)行實現(xiàn),并使用北斗二代衛(wèi)星信號模擬器產(chǎn)生的信號對捕獲系統(tǒng)進(jìn)行性能測試,驗證了硬件實現(xiàn)的正確性,實現(xiàn)對“北斗二代”B1I信號高精度和較高靈敏度的捕獲。
[Abstract]:With the successful operation of the "Beidou second generation" satellite navigation system developed by our country, the development of the part of user equipment, Beidou satellite navigation receiver, is booming, in which signal acquisition is the first important step in the development of the receiver. At present, the research of signal capture mainly focuses on improving the accuracy and sensitivity of GPS satellite signal acquisition. However, the "Beidou second generation" B1I signal has the characteristics of frequent bit polarity reversal. Because the acquisition algorithm for GPS satellite signal can not be directly applied to Beidou navigation receiver, it is of great significance to study the acquisition technology of Beidou second generation B1I signal for the development of Beidou navigation receiver. Firstly, the structure of Beidou second generation satellite signal and the traditional acquisition algorithm are analyzed and studied. Aiming at the problem that the bit polarity flips frequently in Beidou second generation B1I signal, a parallel coarse acquisition algorithm in time domain is designed. The performance of the algorithm is analyzed and verified by experiments. Aiming at the low accuracy of carrier Doppler frequency shift obtained from coarse acquisition, a carrier frequency fine acquisition algorithm using Chebyshev linear least square curve fitting method is designed. The performance of the algorithm is analyzed and the experimental results show that the accuracy of carrier frequency estimation is up to 20 Hz, which can effectively improve the accuracy of carrier frequency estimation. For the signal capture in the weak signal environment such as city and indoor, the differential incoherent integral algorithm and the coherent integral algorithm of local modulated NH code are designed for GEO satellite and IGSO/MEO satellite respectively. It is verified that the algorithm can improve the weak signal acquisition ability of 7dB. Finally, the rough acquisition algorithm, fine acquisition algorithm and weak signal acquisition algorithm are composed of the signal acquisition system, which is implemented on the FPGA DSP navigation receiver development platform. The performance of the acquisition system is tested by using the signal generated by the Beidou second generation satellite signal simulator, which verifies the correctness of the hardware implementation and realizes the acquisition of the "Beidou second generation" B1I signal with high accuracy and high sensitivity.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN967.1

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